<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片布局区域 -->
    <el-card class="box-card">
      <!-- 提示信息 -->
      <el-alert title="添加商品信息" type="info" :closable="false" center show-icon> </el-alert>

      <!-- 添加商品步骤显示器 -->
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息">基本信息</el-step>
        <el-step title="商品参数">商品参数</el-step>
        <el-step title="商品属性">商品属性</el-step>
        <el-step title="商品图片">商品图片</el-step>
        <el-step title="商品内容">商品内容</el-step>
        <el-step title="完成">完成</el-step>
      </el-steps>

      <!-- tabs 区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="160px">
        <el-tabs v-model="activeIndex" tab-position="left" @tab-click="tabClick" :before-leave="leaveHandle">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="addFormProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="(item, index) in manyData" :key="index">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox size="mini" border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="(item, index) in onlyData" :key="index">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload :headers="headerObj" :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" :on-success="handleSuccess" list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button @click="addGoods" class="addBtn" type="primary">主要按钮</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
      <img :src="previewPath" class="previewImg" alt="" />
    </el-dialog>
  </div>
</template>

<script>
// import _ from 'lodash'

export default {
  name: 'AddGoods',
  data() {
    return {
      activeIndex: '0',
      // 添加表单绑定的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [], // 图片的数组
        goods_introduce: '',
        attrs: []
      },
      // 添加表单验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入活动名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入活动重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入活动数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 商品分类列表数据
      cateList: [],
      // 级联选择器配置项
      addFormProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数列表数据
      manyData: [],
      // 静态属性列表数据
      onlyData: [],
      // 上传图片的URL地址
      uploadURL: 'http://118.190.160.53:8089/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的地址
      previewPath: '',
      // 控制图片预览对话框的显示与隐藏
      previewDialogVisible: false
    }
  },
  created() {
    // 调用获取商品分类列表数据的方法
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表数据
    async getCateList() {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) this.$message.error(res.meta.msg)
      this.cateList = res.data
    },

    // 级联选择器改变之后触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },

    // 监听 tabs 有没有切换，切换之前触发这个方法
    leaveHandle(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择分类')
        return false
      }
    },

    // tab 被选中时触发的函数
    async tabClick() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })

        this.manyData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

        // res.data.forEach(item => {
        //   item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        // })

        this.onlyData = res.data
      }
    },

    // 处理图片预览效果
    handlePreview(file) {
      // console.log(file)
      this.previewPath = file.url
      this.previewDialogVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      // 1. 获取将要被移除的图片的临时路径
      const removeImg = file.response.data.tmp_path
      // 2. 从 pics 数组中找到这个图片对应的索引
      const index = this.addForm.pics.findIndex(item => {
        return item.pic === removeImg
      })
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },

    // 添加商品逻辑
    addGoods() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请输入商品的基本信息')
        }

        // 添加商品的具体逻辑
        // 方法一：
        // cloneDeep 是 lodash 给提供的一个方法，主要实现深拷贝
        // 在方法参数中传入需要深拷贝的数据，就会返回一个新数据
        // const newAddform = _.cloneDeep(this.addForm)
        // 按照接口文档要求，将 数组形式的goods_cat 转换成 以 , 连接的字符串形式
        // newAddform.goods_cat = newAddform.goods_cat.join(',')

        // 方法二：
        // 课程中使用 lodash 实现对数组的深拷贝
        // 但是不建议使用，因为只对一个数据使用，没必要使用深拷贝
        // 我们可以使用 拓展运算符 来进行实现
        // 注意: 如果数组是【一位数组和对象】时，拓展运算符完全可以实现深拷贝
        const newAddform = { ...this.addForm }
        newAddform.goods_cat = newAddform.goods_cat.join(',')

        // 处理动态参数
        this.manyData.forEach(item => {
          const newParams = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newParams)
        })
        // 处理静态属性
        this.onlyData.forEach(item => {
          const newParams = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newParams)
        })

        newAddform.attrs = this.addForm.attrs

        // 发起请求，添加商品
        const { data: res } = await this.$http.post('/goods', newAddform)
        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        this.$message.success(res.meta.msg)
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return false
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps {
  margin: 20px 0;
}

/deep/ .el-step__title {
  font-size: 13px;
}

/deep/ .el-checkbox {
  margin: 8px 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

/deep/ .ql-editor {
  min-height: 300px;
}

.addBtn {
  margin-top: 20px;
}
</style>
